// -----------------------------------------------------------------------------
// This source file is part of Matrix Platform
// 	(Universal .NET Software Development Platform)
// For the latest info, see http://www.matrixplatform.com
// 
// Copyright (c) 2009-2010, Ingenious Ltd
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// THE SOFTWARE.
// -----------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Text;

namespace Matrix.Common.FrontEnd.InputHanders
{
    /// <summary>
    /// Assign attribute to control classes that need to join the shortcut handling system.
    /// </summary>
    public class AutomatedControlEventHandlerAttribute : Attribute
    {
        Type[] _handlerClassTypes;

        /// <summary>
        /// 
        /// </summary>
        public Type[] HandlerClassTypes
        {
            get { return _handlerClassTypes; }
        }

        /// <summary>
        /// Constructor.
        /// </summary>
        /// <param name="handlerClassType"></param>
        public AutomatedControlEventHandlerAttribute(Type handlerClassType)
        {
            if (handlerClassType.IsSubclassOf(typeof(AutomatedControlEventHandler)) == false)
            {
                throw new Exception("Only shortcut handler classes can be used as attribute parameter.");
            }

            _handlerClassTypes = new Type[] { handlerClassType };
        }

        /// <summary>
        /// Constructor.
        /// </summary>
        /// <param name="handlerClassType"></param>
        public AutomatedControlEventHandlerAttribute(Type[] handlerClassTypes)
        {
            foreach (Type handlerClassType in handlerClassTypes)
            {
                if (handlerClassType.IsSubclassOf(typeof(AutomatedControlEventHandler)) == false)
                {
                    throw new Exception("Only shortcut handler classes can be used as attribute parameter.");
                }
            }

            _handlerClassTypes = handlerClassTypes;
        }

        /// <summary>
        /// Helper, extract Attributes types values from a class.
        /// </summary>
        /// <param name="classType"></param>
        /// <returns></returns>
        public static Type[] GetClassHandlerTypes(Type classType)
        {
            object[] attributes = classType.GetCustomAttributes(false);
            List<Type> result = new List<Type>();

            foreach (object attribute in attributes)
            {
                if (attribute is AutomatedControlEventHandlerAttribute)
                {
                    result.AddRange(((AutomatedControlEventHandlerAttribute)attribute).HandlerClassTypes);
                }
            }

            return result.ToArray();
        }
    }
}
